Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Changes in Level 3 Fair Values (Details)

v3.8.0.1
Fair Value Measurements - Changes in Level 3 Fair Values (Details) - Contingent Consideration - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 541 $ 841
Initial contingent consideration 812 245
Net gain on change in fair value (939) (545)
Ending balance $ 414 $ 541