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Liquidity (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  | 1 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 16, 2018 USD ($) $ / shares shares | May 01, 2018 USD ($) | Mar. 09, 2018 USD ($) $ / shares | Mar. 07, 2018 USD ($) tranche $ / shares shares | Dec. 29, 2017 shares | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) shares
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Warrants issued (in shares) | shares | 11,520,000 |  |  |  | 316,163 |  |  |
Sale of stock, price per share (in usd per share) | $ / shares | $ 2.10 |  |  |  |  |  |  |
Exercise price (usd per share) | $ / shares | $ 0.0001 |  |  |  |  |  |  |
Warrant term | 5 years |  |  |  | 5 years |  |  |
Sale of stock, consideration received on transaction | $ 21,600 |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) | shares |  |  |  |  |  |  | 0 | 0
Cash and cash equivalents |  |  |  |  |  |  | $ 5,337 | $ 2,319
Restricted cash and cash equivalents |  |  |  |  |  |  | 114 | $ 10,431
Accounts payable and accrued liabilities |  |  |  |  |  |  | $ 6,000 |
Series A- Convertible Preferred Stock |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of private placement |  |  |  | $ 10,700 |  |  |  |
Series A- Convertible Preferred Stock | First Tranche |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of private placement |  |  | $ 6,000 |  |  |  |  |
Series A- Convertible Preferred Stock | Second Tranche |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of private placement |  | $ 4,700 |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction | shares | 6,845,000 |  |  |  |  |  |  |
Warrant term | 5 years |  |  |  |  |  |  |
Warrant |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction | shares | 4,675,000 |  |  |  |  |  |  |
Sale of stock, price per share (in usd per share) | $ / shares | $ 2.0999 |  |  |  |  |  |  |
Warrant term | 5 years |  |  |  |  |  |  |
Purchase Agreement | Series A Non-voting Convertible |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Warrants issued (in shares) | shares |  |  |  | 1,383,631 |  |  |  |
Warrant term |  |  |  | 5 years 6 months |  |  |  |
Preferred stock, shares issued (in shares) | shares |  |  |  | 10,700 |  |  |  |
Conversion price (USD per share) | $ / shares |  |  |  |  |  |  | $ 1.00 |
Purchase Agreement | Series A- Convertible Preferred Stock |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Conversion price (USD per share) | $ / shares |  |  | $ 5.80 | $ 6.59 |  |  |  |
Number of tranches | tranche |  |  |  | 2 |  |  |  |
Forecast |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of warrants |  |  |  |  |  | $ 4,200 |  |

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