Summary of Significant Accounting Policies - Recently Issued Accounting Standards (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Jul. 01, 2016	Mar. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Reclassification of deferred tax current assets to non-current assets				$ 900	$ 900
Additional tax expense	$ 100	$ 100
Taxes remitted for shares withheld from equity-based compensation transactions		274	$ 326
ASU 2016-09
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Taxes remitted for shares withheld from equity-based compensation transactions		$ 300	$ 300
Sales Revenue, Net [Member] | Time and Material or Progress Billing Method of Accounting [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Revenue, percent		97.00%
Sales Revenue, Net [Member] | Proportional Method of Accounting [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Revenue, percent		3.00%