Cash and Cash Equivalents and Fair Value of Financial Instruments - Assets Measured at Fair Value On A Recurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		$ 10,114
Payment for contingent consideration	$ 3,000	0	$ 0
Gain related to contingent liability	600	0	$ 0
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash	54,488	72,103
Cash equivalents	0	10,114
Total cash and cash equivalents	54,488	$ 82,217
Avantec Heathcare Limited
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payment for contingent consideration	3,000
Contingent consideration, accrued interest paid	200
Business Combinations, Contingent Liability, Before Gain Recgonition	3,000
Business Combination, Contingent Consideration, Liability	2,400
Gain related to contingent liability	$ 600