Stock-Based Compensation - Summary of Option and RSU Activity (Details) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Number of Shares
Options granted (in shares)		0
Options | Mosy Plans [Member]
Shares Available for Grant
Balance at the beginning of the year (in shares)	114,000
Restricted stock units cancelled and returned to Plan (in shares)	5,000
Options granted (in shares)	(1,000)
Options cancelled and returned to Plan (in shares)	15,000
Balance at the end of the year (in shares)	183,000
Number of Shares
Balance at the beginning of the period (in shares)	522,000
Options granted (in shares)	1,000
Options cancelled and returned to Plan (in shares)	(15,000)
Balance at the end of the period (in shares)	508,000
Weighted Average Exercise Prices
Weighted-average exercise price (in dollars per share)	$ 14.06		$ 13.88
Options granted (in dollars per share)	2.36
Options cancelled and returned to Plan (in dollars per share)	$ 6.94
Options | Equity Incentive Plan2010 [Member]
Shares Available for Grant
Additional shares authorized	50,000