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Commitments and Contingencies - Additional Information (Details) shares in Thousands, ¥ in Billions |  | 2 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 26, 2019 USD ($) | May 03, 2019 USD ($) | Mar. 02, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2019 JPY (¥) | Jun. 24, 2016 USD ($) | Jul. 31, 2015 USD ($) shares
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unfunded Commitments for Capital Contributions |  |  |  | $ 12,045,000 |  | $ 12,045,000 |  |  |  |  |
Cash Paid For Contingent Consideration |  |  |  |  |  | 2,008,000 |  |  |  |  |
Business Combination, Contingent Consideration, Liability |  |  |  | 312,000 |  | 312,000 |  |  |  |  |
Asset Acquisition Contingent Consideration Liability |  |  |  | 4,463,000 |  | 4,463,000 |  |  |  |  |
Asset Acquisition Contingent Consideration Arrangements Change In Amounts Of Contingent Consideration Liability |  |  |  |  | $ 2,938,000 |  | $ 3,971,000 |  |  |  |
Underwritten Shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 293
Aggregate Offering Price |  |  |  |  |  |  |  |  |  |  | $ 30,800,000
Foreign Exchange Forward [Member] |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative Asset, Notional Amount |  |  |  |  |  |  |  | $ 35,598,000 | ¥ 3.8 |  |
BBVA Bancomer [Member] |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum Borrowing Capacity |  |  |  | $ 7,599,000 |  | $ 7,599,000 |  |  |  |  |
Secured Line of Credit [Member] | PNC Bank [Member] |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  | $ 30,000,000 |
Amount Outstanding During Period |  | $ 30,000,000 | $ 30,000,000 |  |  |  |  |  |  |  |
Unsecured Line of Credit [Member] | PNC Bank [Member] |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum Borrowing Capacity | $ 20,000,000 |  |  |  |  |  |  |  |  |  |
Inter-Bank Balance Interest Rate [Member] | BBVA Bancomer [Member] |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  | 0.10% |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Secured Line of Credit [Member] | PNC Bank [Member] |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.25% |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Unsecured Line of Credit [Member] | PNC Bank [Member] |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.50% |  |  |  |  |  |  |  |  |  |

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