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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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