Stockholders' Equity - Restricted Stock Units (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($) $ / shares shares
Restricted Stock Units
Weighted average period to recognize stock compensation expense	1 year 7 months 6 days
RSUs
Restricted Stock Units
Number of shares of common stock to be paid upon vesting of RSU	1
Unrecognized compensation cost | $	$ 1.7
Weighted average period to recognize stock compensation expense	1 year 9 months 18 days
Restricted Stock Units
Outstanding at beginning of period	394,132
Granted during period	367,985
Vested during period	(128,225)
Forfeited during period	(16,980)
Outstanding at the end of the period	616,912
Weighted-Average Grant Date Fair Value
Outstanding beginning of period | $ / shares	$ 4.96
Granted during period | $ / shares	2.17
Vested during period | $ / shares	5.77
Forfeited during period | $ / shares	3.50
Outstanding end of period | $ / shares	$ 3.17
Minimum | 2010 Equity Incentive Plan
Restricted Stock Units
Vesting period	3 years
Minimum | RSUs
Restricted Stock Units
Vesting period	3 years
Maximum | 2010 Equity Incentive Plan
Restricted Stock Units
Vesting period	4 years
Maximum | RSUs
Restricted Stock Units
Vesting period	4 years