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Debt Obligations - Additional Information (Detail) (USD $)
 3 Months Ended 1 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Jan. 31, 2014
Dec. 31, 2011
May 07, 2014
Subsequent Event [Member]
Apr. 30, 2010
2010 Credit Agreement [Member]
Mar. 31, 2013
2010 Credit Agreement [Member]
Dec. 31, 2012
December 2011 Note and Warrant Agreement [Member]
Dec. 11, 2013
2011-2012 Notes [Member]
Mar. 31, 2014
2011-2012 Notes [Member]
Dec. 31, 2012
2011-2012 Notes [Member]
Dec. 31, 2011
2011-2012 Notes [Member]
Dec. 11, 2013
June 2013 Note and Warrant Agreement [Member]
Jun. 30, 2013
June 2013 Note and Warrant Agreement [Member]
Mar. 31, 2013
June 2013 Note and Warrant Agreement [Member]
Mar. 31, 2014
June 2013 Note and Warrant Agreement [Member]
Mar. 31, 2014
2013 Credit Agreement [Member]
Dec. 31, 2013
2013 Credit Agreement [Member]
Dec. 11, 2013
Series D-2 Convertible Preferred Stock [Member]
Dec. 11, 2013
Series D-2 Convertible Preferred Stock [Member]
2011-2012 Notes [Member]
Dec. 11, 2013
Series D-2 Convertible Preferred Stock [Member]
June 2013 Note and Warrant Agreement [Member]
Dec. 11, 2013
Series D-1 Convertible Preferred Stock [Member]
Dec. 11, 2013
Series D-1 Convertible Preferred Stock [Member]
2011-2012 Notes [Member]
Mar. 31, 2013
2013 Credit Agreement [Member]
May 07, 2014
2013 Credit Agreement [Member]
Subsequent Event [Member]
Apr. 30, 2010
Term Loan [Member]
2010 Credit Agreement [Member]
Apr. 30, 2010
Revolving Credit Facility [Member]
2010 Credit Agreement [Member]
Mar. 17, 2014
Two Thousand Thirteen Credit Facility [Member]
Jun. 30, 2014
Two Thousand Thirteen Credit Facility [Member]
Forecast [Member]
Dec. 31, 2011
Maximum [Member]
December 2011 Note and Warrant Agreement [Member]
Debt Obligations [Line Items]                                                            
Credit facility agreement amount           $ 15,000,000                     $ 5,000,000 $ 10,000,000               $ 5,000,000 $ 10,000,000      
Interest at a rate of London InterBank plus           0.95%                                                
Deemed contribution of a loan guarantee   3,930,000       6,338,000                                   3,930,000            
Unamortized deferred financing costs             153,000                                              
Amortization of deferred financing costs 536,000 709,000               0         0                              
Weighted-average interest rate 1.19% 1.37%                                                        
Interest expense 44,000 50,000                                                        
Loan repayments from proceeds from IPO                                                         7,500,000  
Borrowings to pay outstanding amounts under credit agreement                                                         7,500,000  
Repayment date of credit agreement                                                       Dec. 31, 2014    
Outstanding debt         15,000,000                                       15,000,000          
Debt agreement, maximum borrowing capacity                           1,500,000                               15,000,000
Convertible notes aggregate amount                       11,444,000   899,000                                
Number of warrants issued to purchase common stock     19,048 26,000               26,000             87,532                      
Exercise price of warrants     0.20 0.20               0.20             0.20                      
Notes stated interest rate                     8.00%         8.00%                            
Required percentage written consent by holders of outstanding aggregated principle amount of convertible notes 70.00%                                                          
Fair value of issued warrants               328,000           1,168,000                                
Fair value of issued warrants above the face value of the Notes expensed at issuance                           269,000                                
Remaining amount of the fair value of issued warrants                           899,000                                
Outstanding principal                 11,444,000       899,000                                  
Accrued interest                 $ 1,640,000       $ 33,000                                  
Shares converted to preferred stock                                     3,956,985 3,291,443 665,542 6,054,255 6,054,255              
Convertible preferred stock conversion price                                       $ 1.40 $ 1.40   $ 1.40              
Conversion price adjusted per share                 $ 1.40       $ 1.40