Summary of Significant Accounting Policies- Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Significant Accounting Policies [Line Items]
Deferred revenue	$ 2,900,000		$ 2,900,000		$ 3,200,000
Sales commissions	70,000	$ 59,000	$ 239,000	$ 160,000
Percentage of cash discount offered to customers			2.00%
Projects in Progress	19,500		$ 19,500
Convertible Debt	14,300,000		14,300,000
Fulfillment Center [Member]
Significant Accounting Policies [Line Items]
Payments To Acquire of Inventory			33,000
Genetic Test Revenue [Member]
Significant Accounting Policies [Line Items]
Breakage Revenue	39,000	$ 86,000	167,000	$ 242,000
Customer Payment [Member]
Significant Accounting Policies [Line Items]
Deferred revenue	300,000		300,000
Kits Components [Member]
Significant Accounting Policies [Line Items]
Deferred revenue	2,700,000		2,700,000
Distributors [Member]
Significant Accounting Policies [Line Items]
Deferred revenue	$ 2,400,000		$ 2,400,000