SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 13,744	$ 16,278	$ 26,822	$ 31,518
Cinema Equipment Business
Disaggregation of Revenue [Line Items]
Revenues	7,491	10,025	14,606	19,813
Content & Entertainment
Disaggregation of Revenue [Line Items]
Revenues	6,253	$ 6,253	12,216	$ 11,705
Phase I Deployment | Cinema Equipment Business
Disaggregation of Revenue [Line Items]
Revenues	2,663		5,268
Phase II Deployment | Cinema Equipment Business
Disaggregation of Revenue [Line Items]
Revenues	3,257		6,437
Services | Cinema Equipment Business
Disaggregation of Revenue [Line Items]
Revenues	1,571		2,901
Base Distribution Business | Content & Entertainment
Disaggregation of Revenue [Line Items]
Revenues	3,971		7,733
OTT Streaming and Digital | Content & Entertainment
Disaggregation of Revenue [Line Items]
Revenues	$ 2,282		$ 4,483