Stockholders' (Deficit) Equity - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options Outstanding, Ending Balance (in shares)	187,707
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Ending Balance, Weighted Average Exercise Price (in dollars per share)	$ 5.78
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options Outstanding, Beginning Balance (in shares)	1,394,869	1,030,521	1,140,231
Granted (in shares)		850,000
Exercised (in shares)	(226,011)	(171,718)	(73,043)
Canceled (in shares)	(533,484)	(313,934)	(34,567)
Forfeited (in shares)	(447,667)		(2,100)
Options Outstanding, Ending Balance (in shares)	187,707	1,394,869	1,030,521
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Beginning Balance, Weighted Average Exercise Price (in dollars per share)	$ 3.40	$ 5.29	$ 5.21
Granted, Weighted Average Exercise Price (in dollars per share)		2.68
Exercised, Weighted Average Exercise Price (in dollars per share)	1.41	1.68	1.82
Canceled, Weighted Average Exercise Price (in dollars per share)	3.99	8.61	12.56
Forfeited, Weighted Average Exercise Price (in dollars per share)	2.71		3.54
Ending Balance, Weighted Average Exercise Price (in dollars per share)	$ 5.78	$ 3.40	$ 5.29