Warrants - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands |
9 Months Ended |
|
|
Sep. 30, 2018 |
Dec. 31, 2017 |
Mar. 31, 2017 |
| Class of Stock [Line Items] |
|
|
|
| Warrant to purchase |
31,474
|
|
|
| Cumulative change in accounting principle (adoption of ASU 2017-11) |
|
|
$ 958
|
| Liabilities |
$ 44,485
|
$ 62,108
|
|
| Rockport Warrants |
|
|
|
| Class of Stock [Line Items] |
|
|
|
| Exercise price of warrants (in USD per share) |
$ 3.80
|
|
$ 3.80
|
| Warrants outstanding (in shares) |
113,526
|
145,000
|
|
| Rockport Warrants | Common Class B |
|
|
|
| Class of Stock [Line Items] |
|
|
|
| Number of shares called by warrants (in shares) |
|
|
145,000
|
| Additional Paid-in Capital |
|
|
|
| Class of Stock [Line Items] |
|
|
|
| Cumulative change in accounting principle (adoption of ASU 2017-11) |
|
|
$ 958
|
| Accounting Standards Update 2017-11 | New Accounting Pronouncement, Early Adoption, Effect |
|
|
|
| Class of Stock [Line Items] |
|
|
|
| Liabilities |
$ (1,000)
|
|
|
| Accounting Standards Update 2017-11 | New Accounting Pronouncement, Early Adoption, Effect | Additional Paid-in Capital |
|
|
|
| Class of Stock [Line Items] |
|
|
|
| Cumulative change in accounting principle (adoption of ASU 2017-11) |
$ 1,000
|
|
|