Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Significant Accounting Policies [Line Items]
Deferred revenue	$ 2,700,000		$ 2,700,000		$ 3,200,000
Sales commissions	85,000	$ 80,000	$ 152,000	$ 168,000
Percentage of cash discount offered to customers			2.00%
Deferred tax assets, valuation allowance	34,700,000		$ 34,700,000
Revenue Recognition, Milestone Method, Revenue Recognized			612,000	673,000
Other Sales Revenue Net	240,813	51,214	939,262	106,526
Contracts Revenue			829,000
License and Services Revenue			109,000
ABG [Member]
Significant Accounting Policies [Line Items]
Purchase Order Placed			3,300,000
Genetic Test Revenue [Member]
Significant Accounting Policies [Line Items]
Breakage Revenue	69,000	$ 52,000	130,000	$ 128,000
Customer Payment [Member]
Significant Accounting Policies [Line Items]
Deferred revenue	200,000		200,000
Kits Components [Member]
Significant Accounting Policies [Line Items]
Deferred revenue	2,500,000		2,500,000
Distributors [Member]
Significant Accounting Policies [Line Items]
Deferred revenue	$ 2,300,000		$ 2,300,000