Stock Plans and Stock-Based Compensation - Schedule of Restricted Stock Unit Activity and Market-based Restricted Stock Unit Activity (Details) - Restricted Stock Units and Market-based Restricted Stock Units	3 Months Ended
	Mar. 31, 2018 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Outstanding, Beginning Balance	784,000
Number of Shares, Outstanding, Granted	107,500
Number of Shares, Outstanding, Vested	(222,624)
Number of Shares, Outstanding, Forfeited	(1,000)
Number of Shares, Outstanding, Ending Balance	667,876