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Fair Value Measurements - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Amortized cost basis in debt security |  | $ 9,000 |  |  |
Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value of debt securities |  | 16,050 | $ 16,050 | $ 9,000 | $ 12,220
Bone Biologics Inc [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Purchase of common stock, value |  | $ 500 |  |  |
Bone Biologics Inc [Member] | Common Stock [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Purchase of stock, shares |  | 250,000 |  |  |
ASU 2016-01 [Member] | Bone Biologics Inc [Member] | Equity Investments [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Increase in previously recorded value of equity investments resulted from new measurement | $ 1,600 |  |  |  |
Impact on remeasurement of equity investments per share before taxes included within other income | $ 0.09 |  |  |  |

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