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Mergers and Acquisitions - Medistem - Additional Information (Details) - Medistem, Inc. $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2016 | Mar. 31, 2014 USD ($) note shares | Dec. 31, 2016 USD ($) | Dec. 31, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |
Percentage of outstanding common stock acquired |  | 100.00% |  |
Business combination, consideration paid, shares issued | shares |  | 714,144 |  |
Cash |  | $ 4,920 |  |
Number of promissory notes settled | note |  | 2 |  |
Total consideration transferred |  | $ 24,995 |  |
Shares surrendered to pay withholding taxes shares | shares |  | 17,695 |  |
Expected useful life of intangible asset | 10 years |  |  |
Business combination, acquisition related cost |  |  | $ 680 |
Selling, general and administrative |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, acquisition related cost |  |  |  | $ 310
Promissory Notes |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total consideration transferred |  | $ 707 |  |

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