Recently Issued Accounting Standards - Additional Information (Details) - USD ($) $ in Thousands |
Mar. 31, 2019 |
Jan. 01, 2019 |
Dec. 31, 2018 |
|---|---|---|---|
| Accounting Changes and Error Corrections [Abstract] | |||
| Operating lease right-of-use assets | $ 15,887 | $ 16,470 | $ 0 |
| Present value of lease liabilities | $ 16,700 | $ 17,300 |