Debt - Additional Information (Detail) (USD $)	0 Months Ended	1 Months Ended	6 Months Ended			6 Months Ended			0 Months Ended			6 Months Ended					6 Months Ended	12 Months Ended	6 Months Ended				6 Months Ended				0 Months Ended			3 Months Ended		6 Months Ended			0 Months Ended						0 Months Ended			0 Months Ended
	May 08, 2013	May 31, 2013	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2013 Conversion Feature	Jun. 30, 2013 Amended securities purchase agreement	May 08, 2013 Amended securities purchase agreement	May 08, 2013 Convertible Notes Payable Subsequent Event	Mar. 31, 2013 Prior Note One	Mar. 31, 2013 Prior Note Two	Jun. 30, 2013 Minimum Conversion Feature	Jun. 30, 2013 Maximum Conversion Feature	Jun. 30, 2013 Note Warrants	Mar. 31, 2013 Note Warrants	May 08, 2013 Note Warrants Amended securities purchase agreement	Jun. 30, 2013 Prior Note Warrnt	Dec. 31, 2012 Prior Note Warrnt	Jun. 30, 2013 Prior Note Warrnt Minimum	Jun. 30, 2013 Prior Note Warrnt Maximum	Jun. 30, 2013 Warrant	May 08, 2013 Warrant	Jun. 30, 2013 Warrant Minimum	Jun. 30, 2013 Warrant Maximum	Jun. 30, 2013 Convertible Debt Warrant Liability	Dec. 31, 2012 Convertible Debt Warrant Liability	Oct. 13, 2011 Notes Payable, Other Payables	May 08, 2013 Massachusetts Development Financing Agency	Oct. 13, 2011 Massachusetts Development Financing Agency	Jun. 30, 2013 Massachusetts Development Financing Agency	Jun. 30, 2012 Massachusetts Development Financing Agency	Jun. 30, 2013 Massachusetts Development Financing Agency	Jun. 30, 2012 Massachusetts Development Financing Agency	Dec. 31, 2012 Massachusetts Development Financing Agency	May 08, 2013 Massachusetts Development Financing Agency Warrant	Jun. 30, 2013 Secured Convertible Promissory Note	Mar. 31, 2013 Secured Convertible Promissory Note	May 08, 2013 Secured Convertible Promissory Note Amended securities purchase agreement	May 08, 2013 Additional Notes Amended securities purchase agreement	Apr. 04, 2013 Additional Notes Amended securities purchase agreement	May 08, 2013 Hercules Technology Growth Capital Loan	Jun. 30, 2013 Hercules Technology Growth Capital Loan	Dec. 31, 2012 Hercules Technology Growth Capital Loan	May 08, 2013 Hercules Technology Growth Capital Loan Warrant	Jun. 30, 2013 Hercules Technology Growth Capital Loan Warrant
Debt Disclosure [Line Items]
Loan amount										$ 2,100,000	$ 333,333																		$ 2,000,000	$ 140,886		$ 140,886
Interest rate of debt									2.00%																			3.00%	6.25%												12.75%
Term of loan																													7 years
Issuance of warrants																													59,524
Issuance of warrants, per share																													$ 2.10
Fair value of warrants																													80,357						15,330						845,922
Payment of direct financing cost																													34,000												107,920
Interest expense																														30,027	31,255	64,533	55,915
Conversion price per share									$ 1.60	$ 3.00	$ 2.50
Debt Instrument, convertible, beneficial conversion feature																	(1,199,517)	1,143,961
Amortization																		2,861
Discount on Debt			88,120	2,428														2,862
Convertible debt, fair value disclosures																		1,233,815
Debt instrument, increase, accrued interest			(51,234)	(5,740)														5,207
Debt instrument, interest rate, effective percentage																																						2.00%
Long-term debt, issued								2,433,333																	5,658,331	1,433,332				1,813,246		1,813,246		1,954,133			2,433,333	5,633,333	3,225,000	333,333		2,000,000	0
Class of warrant or right, outstanding															833,333	3,536,458
Share price			$ 0.31		$ 3.00																															$ 2.50	$ 3.00								$ 1.99
Warrant exercise price		1.35												0.01	0.01		1											0.10													0.01
Class of warrant or right expirations														4 years			4 years
Risk-free interest rate						0.55%													0.48%	0.63%	0.55%						2.00%								1.81%									1.20%
Dividend yield						0.00%											0.00%				0.00%						0.00%								0.00%									0.00%
Expected term in years												3 years 11 months 8 days	4 years 6 months				4 years						3 years 4 months 24 days	4 years			10 years								10 years									7 years
Expected volatility						82.50%													40.40%	44.90%	82.50%						65.00%								66.00%									70.58%
Note Payable, net of fees			1,727,714	603,596										(1,027,770)
Amortization of beneficial conversion feature							23,660
Interest Payable			31,343
Debt instrument maturity term									54 months																																41 months
Debt instrument, unamortized discount							2,314,084
Deferred finance costs, gross																																									190,270
Increase in number of warrants		92,472
Debt instrument, periodic payment, principal																												500,000
Additional warrants issued to purchase common shares																												59,524
Term of warrants																												10 years													7 years
Debt instrument, closing rate																																									16.00%
Debt Instrument, variable rate																																									3.25%
Debt instrument, fee amount																																									3,000,000
Intial loan amount																																									2,000,000
Percentage of fully diluted shares																																									3.50%
Conversion rate description	If the cash balance of the Company and its subsidiaries is less than $1,000,000 during the term of the Notes, the conversion rate will become $1.00 (On May 8, 2013, the $2,433,333 of Prior Notes theretofore issued were converted under these terms).
Derivative liability						1,028,517																								13,350		13,350		111,811								851,620
Debt instrument cash interest rate																																									12.00%
Payment in kind of interest																																									4.00%
Preferred stock value																						0																						1.97
Deferred financing costs			$ 18,674
Estimatednumber of shares granted																																									431,393