Other Current Liabilities (Details) - Carrier - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | |||||
|---|---|---|---|---|---|---|---|
Sep. 19, 2018 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Jul. 25, 2018 |
Mar. 31, 2018 |
|
| Other Current Liabilities | |||||||
| Payment of royalty settlement | $ 3,000 | ||||||
| C200 and C1000 | |||||||
| Other Current Liabilities | |||||||
| Royalties earned | $ 0 | $ 300 | $ 200 | $ 700 | |||
| C200 and C1000 | Accrued expenses | |||||||
| Other Current Liabilities | |||||||
| Current royalty obligation | $ 200 | ||||||
| Second Amendment of Development and License Agreement | |||||||
| Other Current Liabilities | |||||||
| Royalty-related assets | 2,923 | $ 2,923 | |||||
| Amortization period of prepaid royalty | 15 years | ||||||
| Second Amendment of Development and License Agreement | Other current assets | |||||||
| Other Current Liabilities | |||||||
| Royalty-related assets | 124 | $ 124 | |||||
| Second Amendment of Development and License Agreement | Other assets | |||||||
| Other Current Liabilities | |||||||
| Royalty-related assets | $ 2,799 | $ 2,799 | |||||
| Second Amendment of Development and License Agreement | C200 | |||||||
| Other Current Liabilities | |||||||
| Current royalty obligation | $ 3,000 | ||||||