Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands |
The 2018 ATM Offering [Member]
Common Stock [Member]
|
The 2018 ATM Offering [Member]
Additional Paid-in Capital [Member]
|
The 2018 ATM Offering [Member]
AOCI Attributable to Parent [Member]
|
The 2018 ATM Offering [Member]
Retained Earnings [Member]
|
The 2018 ATM Offering [Member] |
The 2017 Purchase Agreement [Member]
Common Stock [Member]
|
The 2017 Purchase Agreement [Member]
Additional Paid-in Capital [Member]
|
The 2017 Purchase Agreement [Member]
AOCI Attributable to Parent [Member]
|
The 2017 Purchase Agreement [Member]
Retained Earnings [Member]
|
The 2017 Purchase Agreement [Member] |
The 2018 Purchase Agreement [Member]
Common Stock [Member]
|
The 2018 Purchase Agreement [Member]
Additional Paid-in Capital [Member]
|
The 2018 Purchase Agreement [Member]
AOCI Attributable to Parent [Member]
|
The 2018 Purchase Agreement [Member]
Retained Earnings [Member]
|
The 2018 Purchase Agreement [Member] |
ATM Offering [Member]
Common Stock [Member]
|
ATM Offering [Member]
Additional Paid-in Capital [Member]
|
ATM Offering [Member]
AOCI Attributable to Parent [Member]
|
ATM Offering [Member]
Retained Earnings [Member]
|
ATM Offering [Member] |
Common Stock [Member] |
Additional Paid-in Capital [Member] |
AOCI Attributable to Parent [Member] |
Retained Earnings [Member] |
Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Balance (in shares) at Dec. 31, 2016 | 15,722,000 | ||||||||||||||||||||||||
| Balance at Dec. 31, 2016 | $ 218,034 | $ 28,719 | $ (4,298) | $ (235,127) | $ 7,328 | ||||||||||||||||||||
| Common shares issued (in shares) | 8,858,000 | 8,858,252 | |||||||||||||||||||||||
| Common shares issued | $ 10,203 | $ 10,203 | |||||||||||||||||||||||
| Stock-based compensation | 666 | 666 | |||||||||||||||||||||||
| Net loss | (8,373) | (8,373) | |||||||||||||||||||||||
| Shares issued on redemption of restricted share units (in shares) | 150,000 | ||||||||||||||||||||||||
| Shares issued on redemption of restricted share units | $ 171 | (171) | |||||||||||||||||||||||
| Balance, September 30, 2018 (in shares) at Sep. 30, 2017 | 24,730,000 | ||||||||||||||||||||||||
| Balance at Sep. 30, 2017 | $ 228,408 | 29,214 | (4,298) | (243,500) | 9,824 | ||||||||||||||||||||
| Balance (in shares) at Dec. 31, 2016 | 15,722,000 | ||||||||||||||||||||||||
| Balance at Dec. 31, 2016 | $ 218,034 | 28,719 | (4,298) | (235,127) | 7,328 | ||||||||||||||||||||
| Common shares issued (in shares) | 357,143 | ||||||||||||||||||||||||
| Balance, September 30, 2018 (in shares) at Dec. 31, 2017 | 27,502,000 | ||||||||||||||||||||||||
| Balance at Dec. 31, 2017 | $ 231,923 | 29,365 | (4,316) | (246,770) | $ 10,202 | ||||||||||||||||||||
| Common shares issued (in shares) | 2,017,000 | 2,017,046 | 5,232,000 | 5,231,953 | 170,000 | ||||||||||||||||||||
| Common shares issued | $ 6,818 | $ 6,818 | $ 14,995 | $ 14,995 | $ 600 | $ 600 | |||||||||||||||||||
| Common shares issued upon exercise of stock options (in shares) | 96,000 | 96,000 | |||||||||||||||||||||||
| Common shares issued upon exercise of stock options | $ 379 | (160) | $ 219 | ||||||||||||||||||||||
| Stock-based compensation | 3,695 | 3,695 | |||||||||||||||||||||||
| Other comprehensive (loss)/gain | 3 | 3 | |||||||||||||||||||||||
| Net loss | (22,607) | (22,607) | |||||||||||||||||||||||
| Balance, September 30, 2018 (in shares) at Sep. 30, 2018 | 35,017,000 | ||||||||||||||||||||||||
| Balance at Sep. 30, 2018 | $ 254,715 | $ 32,900 | $ (4,313) | $ (269,377) | $ 13,925 |