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Revenues - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) Supplier	Sep. 30, 2018	Sep. 30, 2019 USD ($) Supplier	Sep. 30, 2018	Dec. 31, 2018 USD ($)
Revenue from contract with customer [Line Items]
Deferred revenue	$ 3,940		$ 3,940		$ 3,521
Long-term Contract [Member]
Revenue from contract with customer [Line Items]
Deferred revenue	1,790		1,790		1,464
Up Front Payment Arrangement [Member]
Revenue from contract with customer [Line Items]
Deferred revenue	$ 2,150		$ 2,150		$ 2,057
DNA Genotek [Member]
Revenue from contract with customer [Line Items]
Number of third-party suppliers to manufacture DNAG's products | Supplier	2		2
Customer [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Revenue from contract with customer [Line Items]
Percentage of concentration risk			24.00%
Customer [Member] | Net Consolidated Revenue [Member] | Customer Concentration Risk [Member]
Revenue from contract with customer [Line Items]
Percentage of concentration risk	17.00%	39.00%	11.00%	27.00%

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