Grant Revenue - Additional Information (Detail) - USD ($)		12 Months Ended
	Jul. 31, 2010	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2008
Deferred Revenue Disclosure [Abstract]
Maximum borrowing capacity under the agreement				$ 800,000
Stated interest rate				6.00%
Debt maturity date		Dec. 31, 2009
Debt description		Under the terms of the loan agreement, the lender may forgive $240 thousand if the Company meets certain permanent job creation requirements within the State of Ohio. In July 2010, $560 thousand of principal and accrued interest through the loan maturity date were repaid. In September 2015, the remaining $240 thousand was forgiven and was recognized as grant revenue during the year ended December 31, 2015.
Repayment of debt	$ 560,000
Grants awarded from state of Ohio			$ 240,000