Correction of Immaterial Errors (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accounts receivable, net	$ 65,078		$ 57,189
Other receivables	4,222		5,688
Prepaid expenses and other current assets	5,232		7,675
Accounts payable	23,773		23,482
Accrued expenses	7,875		9,366
Retained earnings	79,969		78,467
Total stockholders' equity	$ 83,996	$ 83,291	81,273	$ 70,125	$ 67,347	$ 66,488
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accounts receivable, net			56,003
Other receivables			5,104
Prepaid expenses and other current assets			7,224
Accounts payable			22,453
Accrued expenses			8,977
Retained earnings			77,664
Total stockholders' equity			80,470
Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Retained earnings			803
Adjustments | Recognition of Certain Income and Expenses
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accounts receivable, net			1,186
Other receivables			584
Prepaid expenses and other current assets			451
Accounts payable			1,029
Accrued expenses			389
Retained earnings			803
Total stockholders' equity			$ 803