Property, Equipment and Capitalized Software - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property Plant And Equipment [Line Items]
Capitalized software costs, additions	$ 500	$ 600
Capitalized software developed for internal use	23,489	24,071
Capitalized software costs, accumulated amortization	1,900	1,700
Depreciation and amortization expense	1,647	1,962	$ 2,974
Written-off to direct cost		1,100	1,500
Capitalized Software [Member]
Property Plant And Equipment [Line Items]
Capitalized software developed for internal use	2,683	2,160
Depreciation and amortization expense	$ 200	$ 400	$ 1,200