Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details) (USD $)	3 Months Ended			12 Months Ended		0 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Feb. 04, 2014	Apr. 27, 2015	May 11, 2015	Apr. 30, 2015
Significant Accounting Policies [Line Items]
Allowance for Doubtful Accounts Receivable	$ 68,922	$ 85,068		$ 85,068
Bad debt expense	16,146	0
Change in inventory valuation reserves	21,926		0
Reclassified equipment with a net book value				210,606
Depreciation and leasehold improvement amortization expense	151,493		107,830
Amortization expense for capitalized software costs	0		11,687
Accretion of preferred stock issuance costs	24,077		22,481
Deferred financing costs	132,050	75,131		75,131
Debt issuance cost amortization	18,615		0
Deferred offering costs, noncurrent	1,600,000	1,300,000		1,300,000
Licenses revenue fees				0	0
Convertible preferred stock converted into common stock	2,127,463
Common stock, shares issued	335,152	334,003		334,003
Common Stock, Value, Issued	334	333		333
Series C-2 Preferred Stock Warrants
Significant Accounting Policies [Line Items]
Conversion of stock, shares issued				86,292
Series D Redeemable Convertible Preferred Stock
Significant Accounting Policies [Line Items]
Reverse stock split of common stock	0.009
Conversion of stock, shares issued				39,420
Series E Preferred Stock Warrants
Significant Accounting Policies [Line Items]
Reverse stock split of common stock	0.009					1
Common stock shares sold						354,062	34,099,476
Sales Revenue, Net | Customer Concentration Risk | Customer One
Significant Accounting Policies [Line Items]
Sales revenue percentage	25.00%		19.00%
Sales Revenue, Net | Customer Concentration Risk | Customer Two
Significant Accounting Policies [Line Items]
Sales revenue percentage	23.00%		12.00%
Sales Revenue, Net | Customer Concentration Risk | Customer Three
Significant Accounting Policies [Line Items]
Sales revenue percentage	21.00%		10.00%
Accounts Receivable | Customer Concentration Risk | Customer One
Significant Accounting Policies [Line Items]
Sales revenue percentage	27.00%
Accounts Receivable | Customer Concentration Risk | Customer Two
Significant Accounting Policies [Line Items]
Sales revenue percentage	23.00%
Accounts Receivable | Customer Concentration Risk | Customer Three
Significant Accounting Policies [Line Items]
Sales revenue percentage	14.00%
Revenue from grants and contracts | Customer Concentration Risk
Significant Accounting Policies [Line Items]
Sales revenue percentage	23.00%		29.00%
Software and Software Development Costs
Significant Accounting Policies [Line Items]
Long-term asset, estimated life	3 years
Minimum
Significant Accounting Policies [Line Items]
Long-term asset, estimated life	3 years
Maximum
Significant Accounting Policies [Line Items]
Long-term asset, estimated life	5 years
Subsequent Event
Significant Accounting Policies [Line Items]
Reverse stock split of common stock								0.0093
Convertible notes payable issued										1,500,000
Common stock, at the initial public offering price per shares									$ 14
Subsequent Event | IPO
Significant Accounting Policies [Line Items]
Common stock shares sold									3,570,000
Common stock, at the initial public offering price per shares									$ 14.00
Gross proceeds from initial public offering									50,000,000
Net proceeds from initial public offering after underwriters' fees, commissions and offering costs									45,400,000
Convertible preferred stock converted into common stock									2,134,192
Subsequent Event | IPO | Convertible Note One
Significant Accounting Policies [Line Items]
Conversion price per share									$ 14.00
Conversion of stock, shares issued									324,591
Conversion of stock, amount converted									4,500,000
Subsequent Event | IPO | Series C-2 Preferred Stock Warrants
Significant Accounting Policies [Line Items]
Convertible preferred stock converted into warrants									1,488
Subsequent Event | IPO | Series D Redeemable Convertible Preferred Stock
Significant Accounting Policies [Line Items]
Common stock, shares issued									710,060
Common Stock, Value, Issued									1,750
Subsequent Event | IPO | Series E Preferred Stock Warrants
Significant Accounting Policies [Line Items]
Convertible preferred stock exercisable for purchase of common stock									144,772
Subsequent Event | IPO | Series E Preferred Stock Warrants | Growth Term Loan
Significant Accounting Policies [Line Items]
Convertible preferred stock converted into warrants									374,632
Subsequent Event | IPO | Two Thousand Fourteen Incentive Plan
Significant Accounting Policies [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance									938,858
Subsequent Event | IPO | Two Thousand Eleven Plan
Significant Accounting Policies [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance									12,752
Subsequent Event | IPO | Two Thousand Fourteen Employee Stock Purchase Plan
Significant Accounting Policies [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance									110,820
Subsequent Event | Over-Allotment Option
Significant Accounting Policies [Line Items]
Common stock shares sold									90,076
Proceeds from issuance of common stock									$ 1,300,000