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Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity - USD ($) $ in Thousands | Total | Series A Convertible Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Restricted Stock [Member]
--- | --- | --- | --- | --- | --- | ---
Ending Balance at Dec. 31, 2015 |  | $ 0 |  |  |  |
Beginning Balance at Dec. 31, 2014 | $ 54,206 |  | $ 127 | $ 187,620 | $ (133,541) |
Beginning Balance, Shares at Dec. 31, 2014 |  |  | 12,746,519 |  |  | 8,493
Issuance of common stock from overallotment, net of underwriting fees and issuance costs of $377 | 4,738 |  | $ 5 | 4,733 |  |
Issuance of common stock from overallotment, net of underwriting fees and issuance costs of $377, Shares |  |  | 465,000 |  |  |
Issuance of warrant as part of the consideration for the consulting related to financial support services in March 2015 | 11 |  |  | 11 |  |
Vesting of restricted stock | 0 |  | $ 0 | 0 | 0 | $ 0
Vesting of restricted stock, Shares |  |  | 3,303 |  |  | (3,303)
Stock-based compensation expense | 1,228 |  |  | 1,228 |  |
Exercise of common stock options | 39 |  |  | 39 |  |
Exercise of common stock options, Shares |  |  | 53,458 |  |  |
Net loss | (32,024) |  |  |  | (32,024) |
Ending Balance at Dec. 31, 2015 | 28,198 |  | $ 132 | 193,631 | (165,565) |
Ending Balance, Shares at Dec. 31, 2015 |  |  | 13,268,280 |  |  | 5,190
Issuance of common stock related to private placement | 26 |  | $ 26 |  |  |
Issuance of common stock related to private placement, Shares |  |  | 2,596,059 |  |  |
Issuance of Series A convertible preferred stock | 0 | $ 0 | $ 0 | 0 | 0 | $ 0
Issuance of Series A convertible preferred stock, Shares |  | 24,159 |  |  |  |
Conversion of Series A convertible preferred stock | 0 | $ 0 | $ 0 | 0 | 0 | 0
Conversion of Series A convertible preferred stock, Shares |  | (10,743) | 4,774,398 |  |  |
Ending Balance at Dec. 31, 2016 |  | $ 0 |  |  |  |
Ending Balance, Shares at Dec. 31, 2016 |  | 13,416 |  |  |  |
Vesting of restricted stock | 0 |  | $ 0 | 0 | 0 | $ 0
Vesting of restricted stock, Shares |  |  | 3,301 |  |  | (3,301)
Stock-based compensation expense | 1,548 |  |  | 1,548 |  |
Exercise of common stock options | $ 3 |  | $ 1 | 2 |  |
Exercise of common stock options, Shares | 3,685 |  | 3,685 |  |  |
Net loss | $ (16,208) |  |  |  | (16,208) |
Ending Balance at Dec. 31, 2016 | $ 13,567 |  | $ 159 | $ 195,181 | $ (181,773) |
Ending Balance, Shares at Dec. 31, 2016 |  |  | 20,645,723 |  |  | 1,889

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