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Business Combinations - Consideration Transferred (Details) - USD ($) $ / shares in Units, shares in Thousands | Oct. 06, 2017 | Jan. 08, 2016 | Dec. 31, 2018
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Crystal |  |  |
Business Acquisition [Line Items] |  |  |
Cash paid to Crystal shareholders | $ 26,877,000 |  |
Cash payable to Crystal Shareholders | 336,000 |  | $ 200,000
Assumed liabilities | 129,000 |  |
Fair value of contingent consideration | 8,401,000 |  |
Cash consideration | 27,200,000 |  |
Total share consideration | 10,500,000 |  |
Total consideration | $ 35,743,000 |  |
OMT |  |  |
Business Acquisition [Line Items] |  |  |
Assumed liabilities |  | $ 1,528,000 |
Cash consideration |  | $ 96,006,000 |
Actual number of shares issued (shares) |  | 790 |
Common stock price (USD per share) |  | $ 98 |
Total share consideration |  | $ 77,373,000 |
Total consideration |  | $ 173,379,000 |

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