Net Loss Per Share (Details 1) - shares shares in Thousands |
3 Months Ended | |
---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
|
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Antidilutive securities | 4,058 | 7,373 |
Options to purchase common stock [Member] | ||
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Antidilutive securities | 2,466 | 1,979 |
Warrants for common stock [Member] | ||
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Antidilutive securities | 1,592 | 4,085 |
Common stock issuable upon conversion of preferred shares [Member] | ||
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Antidilutive securities | 0 | 1,309 |