Credit Facility - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Line of Credit Facility [Line Items]
Current borrowing capacity	$ 10,000,000
Line of credit facility, collateral	Obligations under the Credit Agreement are secured by a first priority security interest in certain eligible accounts receivable, 65% of the equity of our subsidiary, DNAG, and certain related assets.
Borrowings	$ 0	$ 0
Unused capacity commitment fee	0.375%
Maturity date of credit facility	Sep. 30, 2019
Maximum [Member]
Line of Credit Facility [Line Items]
Additional revolving commitments	$ 5,000,000
Line of Credit [Member]
Line of Credit Facility [Line Items]
Minimum fixed charge coverage ratio	110.00%
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Line of credit, interest rate	2.50%
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Current borrowing capacity	$ 2,500,000