Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Fair value assumptions used in estimating fair value of warrants [Abstract]
Stock-based compensation expense			$ 3,979	$ 5,326
New issue of shares of common stock as a result of RSUs which vested (in shares)			135,102
Options exercised (in shares)			50,357
General and Administrative Expense [Member]
Fair value assumptions used in estimating fair value of warrants [Abstract]
Stock-based compensation expense	$ 1,423	$ 1,889	$ 3,979	$ 5,326
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	0	0	429,000	294,000
Options granted, weighted average grant date fair value (in dollars per share)			$ 3.25	$ 4.19
Fair value assumptions used in estimating fair value of warrants [Abstract]
Dividend yield			0.00%	0.00%
Expected stock price volatility			80.00%	86.00%
Risk-free interest rate			1.84%	2.21%
Expected term			6 years	6 years
Unrecognized stock-based compensation expense expected to be recognized	$ 4,890		$ 4,890
Weighted average amortization period			2 years 10 months 10 days
Restricted Stock Units (RSUs) [Member]
Fair value assumptions used in estimating fair value of warrants [Abstract]
RSUs granted (in shares)	0	0	219,331	162,665
Weighted average grant date fair value of RSU's granted (in dollars per share)	$ 4.75	$ 5.57	$ 4.75	$ 5.57
Unrecognized stock-based compensation expense expected to be recognized	$ 2,796		$ 2,796
Weighted average amortization period			2 years 8 months 12 days
2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance (in shares)	14,124,469		14,124,469
Shares available for grant (in shares)	421,221		421,221