Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 36,871	$ 35,401	$ 34,039	$ 33,549	$ 32,947	$ 31,769	$ 30,347	$ 27,922	$ 139,860	$ 122,985	$ 121,768
UK [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									6,299	6,651	8,167
USA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									121,732	108,142	107,077
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									568	1,203	1,748
Malaysia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									5,949	5,248	3,625
India [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									531	1,362	1,092
Singapore [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									1,299	$ 379	$ 59
Ireland [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									$ 3,482