The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Organization and Basis of Presentation - Additional Information (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Date of incorporation									Jan. 29, 2007
Net loss	$ (2,624,152)	$ (2,735,400)	$ (3,241,163)	$ (3,520,748)	$ (2,919,803)	$ (3,825,354)	$ (3,547,040)	$ (2,955,484)	$ (12,121,463)	$ (13,247,681)
Accumulated deficit	(48,060,612)				(35,939,149)				(48,060,612)	(35,939,149)
Cash and cash equivalents	8,691,155				14,155,809				8,691,155	14,155,809	$ 24,196,691
Square 1 Bank [Member] \| Loan and security agreement [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Borrowings under bank credit facility	$ 4,500,000				$ 4,500,000				$ 4,500,000	$ 4,500,000