OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Jun. 30, 2018 |
Dec. 31, 2017 |
Sep. 30, 2017 |
Jun. 30, 2017 |
Mar. 31, 2017 |
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2017 |
Dec. 31, 2016 |
May 14, 2018 |
Dec. 27, 2013 |
|
| Cash, Cash Equivalent And Marketable Securities | $ 2,200 | $ 2,200 | |||||||||||
| Working Capital Deficit | 2,100 | 2,100 | |||||||||||
| Retained Earnings (Accumulated Deficit), Total | (380,380) | $ (374,698) | (380,380) | $ (374,698) | |||||||||
| Operating Income (Loss), Total | (1,754) | $ (2,062) | $ (1,991) | $ 582 | 1,729 | $ (2,069) | $ (3,079) | $ (3,138) | (5,225) | (6,557) | |||
| Net Income (Loss) Attributable to Parent, Total | (1,738) | $ (2,200) | $ (2,149) | $ 405 | $ 1,534 | $ (2,250) | $ (3,288) | $ (3,384) | (5,682) | $ (7,388) | |||
| Debt Instrument, Face Amount | $ 10,000 | ||||||||||||
| Loan Agreement With Oxford [Member] | |||||||||||||
| Long-term Line of Credit | $ 2,700 | $ 2,700 | |||||||||||
| Subsequent Event [Member] | Schutte Note [Member] | |||||||||||||
| Debt Instrument, Face Amount | $ 1,000 | ||||||||||||
| Proceeds from Issuance of Long-term Debt | $ 1,000 | ||||||||||||
| Subsequent Event [Member] | Loan Agreement With Oxford [Member] | |||||||||||||
| Long-term Line of Credit | $ 1,800 | ||||||||||||