Summary of Significant Accounting Policies- Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Significant Accounting Policies [Line Items]
Deferred revenue	$ 3,800,000	$ 1,600,000
Sales commissions	367,000	726,000
Percentage of cash discount offered to customers	2.00%
Deferred tax assets, valuation allowance	28,185,000	30,909,000
Advertising Expense	5,000	18,000
Inventory Raw Materials	180,948	154,485
Deferred Tax Assets, Gross	28,185,000	30,909,000
Debt Conversion Converted Instrument Into Common Stock Approximate Value	14,300,000
Federal R&D Tax Credit [Member]
Significant Accounting Policies [Line Items]
Deferred Tax Assets, Gross	61,000
Fulfillment Center [Member]
Significant Accounting Policies [Line Items]
Inventory Raw Materials	41,000	0
Genetic Test Revenue [Member]
Significant Accounting Policies [Line Items]
Breakage Revenue	213,000
Customer Payment [Member]
Significant Accounting Policies [Line Items]
Deferred revenue	$ 584,000