OPERATIONS AND BASIS OF PRESENTATION Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Jun. 28, 2018	Dec. 31, 2013
Cash, Cash Equivalent And Marketable Securities		$ 800
Working Capital Deficit		3,400
Retained Earnings (Accumulated Deficit), Total		(381,874)		$ (380,380)
Operating Income (Loss), Total		(1,395)	$ 582	5,200
Net Income (Loss) Attributable to Parent, Total		(1,494)	$ 405
Debt Instrument, Face Amount						$ 10,000
Cash, Cash Equivalents, and Refundable Deposits					$ 700
First Revenue Event Does Not Occurs [Member]
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid		795
Loan Agreement With Oxford [Member]
Net Income (Loss) Attributable to Parent, Total				$ 5,700
Long-term Line of Credit		$ 2,100			$ 1,500
Oxford Term Loan Agreement [Member] | Subsequent Event [Member]
Proceeds from Issuance of Long-term Debt	$ 1,500
Schutte Note [Member] | Subsequent Event [Member]
Debt Instrument, Face Amount	$ 1,500