SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 9,803	$ 13,078
Cinema Equipment Business
Disaggregation of Revenue [Line Items]
Revenues	3,993	7,115
Content & Entertainment
Disaggregation of Revenue [Line Items]
Revenues	5,810	5,963
Phase I Deployment | Cinema Equipment Business
Disaggregation of Revenue [Line Items]
Revenues	1,854	2,605
Phase II Deployment | Cinema Equipment Business
Disaggregation of Revenue [Line Items]
Revenues	459	3,180
Services | Cinema Equipment Business
Disaggregation of Revenue [Line Items]
Revenues	1,330	1,330
Digital System Sales | Cinema Equipment Business
Disaggregation of Revenue [Line Items]
Revenues	350	0
Base Distribution Business | Content & Entertainment
Disaggregation of Revenue [Line Items]
Revenues	3,135	3,762
OTT Streaming and Digital | Content & Entertainment
Disaggregation of Revenue [Line Items]
Revenues	$ 2,675	$ 2,201