Debt - Additional Information (Details) (USD $)	3 Months Ended	6 Months Ended				6 Months Ended					1 Months Ended	6 Months Ended			6 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014 Magna Convertible Notes	Jun. 30, 2014 Prior to July 30, 2014 Magna Convertible Notes	Jun. 30, 2014 On or prior to the earlier of October 13, 2014 Magna Convertible Notes	Jun. 30, 2014 Maximum Magna Convertible Notes	Dec. 31, 2012 Senior Secured Credit Facility	Jan. 31, 2014 Term Loan	Jun. 30, 2014 Term Loan	Dec. 31, 2012 Term Loan	Dec. 31, 2012 Revolving Line of Credit Facility	Jun. 30, 2014 GE Secured Lending Facility	Dec. 31, 2013 GE Secured Lending Facility	Jun. 30, 2014 Hercules Term Loan	Jun. 30, 2013 Hercules Term Loan	Jun. 30, 2014 Hercules Term Loan Prime rate plus	Jun. 30, 2014 Hercules Term Loan Maximum Installment	Jun. 30, 2014 Hercules Term Loan Minimum Installment	Jun. 30, 2014 Hercules Term Loan Minimum Through August 15, 2014	Jun. 30, 2014 Hercules Term Loan Minimum Thereafter August 15, 2014	Jun. 30, 2014 Hercules Term Loan Scenario, Forecast	Jun. 30, 2014 Initial Convertible Note	Jun. 30, 2014 Additional Convertible Note
Debt Instrument [Line Items]
Senior secured credit facility, maximum borrowing capacity										$ 21,500,000			$ 18,000,000	$ 3,500,000
Debt and line of credit maturity date		May 31, 2016				Jun. 30, 2016												Jan. 01, 2018
Term loan, payment terms												The term loan included interest only payments for a period of 12 months, followed by monthly principal payments of approximately $600,000 for a period of 30 months, which the Company commenced paying in January 2014.					Interest accrues from the closing date and interest payments are due monthly. Principal payments are required commencing August 1, 2015 and are to be made in 30 equal installments of approximately $700,000, with the remainder due at maturity. If, however, the Company meets certain revenue conditions, the interest only period may be extended through February 1, 2016, reducing the number of required principal payments to 24 equal installments. Additionally, under certain circumstances the Company may, or Hercules Technology may, require that $1.5 million of the principal be paid in the form of shares of common stock at a fixed conversion price of $5.72 per share.
Debt instruments,date of first required payment												Jan. 31, 2014
Debt instrument, periodic principal payment											600,000						700,000
Debt instrument, fixed rate						6.00%						7.50%					10.95%
Revolving line of credit	0	0		0
Final payment fee for debt	720,000	720,000																						1,500,000
Annual management fee	15,000	15,000
Debt instrument, frequency of fee		annual management fee of $15,000 per year
Long-term debt outstanding including unamortized discount	14,400,000	14,400,000					150,000	250,000
Long-term debt outstanding	18,900,000	18,900,000		17,925,000											14,300,000
Unamortized deferred financing costs	1,100,000	1,100,000
Term loan																	20,000,000
Proceeds from line of credit			7,090,000												15,300,000
Loss on extinguishment of debt	(1,596,000)	(1,596,000)													1,600,000
Principal amount of debt instrument	22,900,000	22,900,000		18,000,000												18,000,000	20,000,000								2,900,000	3,500,000
Debt instrument purchase price																									2,500,000	3,500,000
Term loan fee amount																	200,000
Debt description																	The Hercules Term Loan also includes a non-refundable final payment fee of $1.5 million. The final payment fee will increase to $2.0 million in the event that the Company does not receive $3.5 million pursuant to the Additional Convertible Note on or before August 15, 2014. The final payment fee will be accrued and recorded to interest expense over the life of the loan. In addition, the Company issued a warrant to Hercules Technology (“Hercules Warrant”) to purchase 516,129 shares of common stock at an initial exercise price of $4.65, subject to adjustment. The number of shares of common stock for which the Hercules Warrant may be exercisable may be increased to 623,655 if the Company does not receive $3.5 million pursuant to the Additional Convertible Note on or before August 15, 2014.
Contingent non-refundable payment fee																	2,000,000
Received additional convertible notes																	3,500,000
Warrants issued						568,889											516,129
Initial exercisable price						$ 4.65											$ 4.65
Common stock increased																	623,655
Estimated fair value	848,000	848,000				206,000											900,000
Warrant expires date																	Jun. 30, 2019
Deferred financing cost																	1,100,000
Termination fee																	1,200,000
Debt instrument, variable interest rate																			7.70%
Debt instrument, interest rate description						The Magna Convertible Notes mature on June 30, 2016 (subject to extension by the holder) and accrue interest at an annual rate of 6.0%.											The Hercules Term Loan bears interest at the rate of the greater of either (i) the prime rate plus 7.7%, and (ii) 10.95%.
Number of installments for principal payments																				30	24
Debt instrument, periodic principal payment											600,000						700,000
Conversion of stock, amount issued																	1,500,000
Common stock at a fixed conversion price						$ 3.75			$ 4.13								$ 5.72
Debt instrument, covenant description																	The Hercules Term Loan contains certain covenants related to restrictions on payments to certain company affiliates, financial reporting requirements and a minimum liquidity covenant that requires the Company to maintain cash and cash equivalents of no less than $6.0 million through August 15, 2014 and not less than $9.0 million thereafter.
Debt instrument, covenant compliance																	Although the Company was in compliance with the liquidity covenant at June 30, 2014, the Company anticipates that it will be non-compliant with the liquidity covenant during the fourth quarter of 2014, and has therefore classified the entire obligation as a current liability.
Cash and cash equivalents	11,550,000	11,550,000	1,136,000	2,279,000	2,741,000																	6,000,000	9,000,000
Common stock, issued	12,411,207	12,411,207		597,675		50,853
Common stock, $0.01 par value; 250,000,000 shares authorized; 12,411,207 and 597,675 shares issued and outstanding at June 30, 2014 and December 31, 2013, respectively	$ 124,000	$ 124,000		$ 6,000		$ 229,000
Closing sale price of the common stock, percentage						110.00%
Debt instrument, convertible, threshold consecutive trading days						2 days
Debt Instrument convertible notes premium						127.50%
Days of redeemable interest remaining convertible notes						60 days
Percentage of volume weighted average price						80.00%
Debt instrument, convertible, number of threshold consecutive trading days						5
Purchase common stock of exercisable share						257,778
Purchase common stock of remaining shares						311,111