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Covid-19 (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Apr. 16, 2020 | Jun. 30, 2020 | May 31, 2020 | Apr. 30, 2020 | Mar. 31, 2020 | Mar. 31, 2020 | Jul. 24, 2019 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
AVISE CTD test volume, percentage |  | 52.00% | 45.00% |  | 12.00% |  | 2.00% | 31.00% |  |  |  |
Stock-based compensation expense reversal |  |  |  |  |  |  |  | $ (647) |  | $ (11) | $ (1,078) | $ (23)
Coronavirus, Aid, Relief, And Economic Securities (CARES) Act, deferred tax assets, valuation allowance |  |  |  |  | $ 100 | $ 100 |  |  | $ 100 |  |  |
Coronavirus, Aid, Relief, And Economic Securities (CARES) Act, deferred tax assets, income tax benefit |  |  |  |  |  |  |  |  | $ 100 |  |  |
Coronavirus, Aid, Relief, and Economic Securities (CARES) Act, proceeds from loan | $ 2,900 |  |  | $ 700 |  |  |  | $ 700 |  |  | $ 700 |
Share-based Payment Arrangement, Employee |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense reversal |  |  |  |  |  | 100 |  |  |  |  |  |
One-time Termination Benefits |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | $ 300 |  |  |  |  |  |

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