Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

The components of the income tax provision were as follows:

	Year Ended December 31,
	2012		2013
Current
Federal	$	—	$	—
Foreign		—		—
State		—		—
Total		—		—
Deferred
Federal		—		—
Foreign		—		—
State		—		—
		—		—
Income tax provision	$	—	$	—

Schedule of Loss Before Income Tax Provision

For financial statement purposes, loss before income tax provision includes the following components:

	Year Ended December 31,
	2012		2013

Domestic	$	(7,750,861)	$	(8,012,906)
Foreign		(6,218)		(7,609)
	$	(7,757,079)	$	(8,020,515)

Reconciliation of Expected Income Tax Benefit Computed Using Federal Statutory Income Tax Rate

A reconciliation of the expected income tax benefit computed using the federal statutory income tax rate of 34% to the Company’s effective income tax rate is as follows:

	Year Ended December 31,
	2012		2013
Income tax benefit based on federal statutory rate	$	(2,637,000)	$	(2,729,000)
State income tax benefit, net of federal income tax		(216,000)		(413,000)
Change in deferred tax valuation allowance		849,000		3,048,000
Stock-based compensation		988,000		75,000
Foreign net operating loss		785,000		—
Other, net		231,000		19,000
Income tax provision	$	—	$	—

Schedule of Deferred Tax Assets and Deferred Tax Liabilities

The tax effects of temporary differences that give rise to significant portions of the Company’s deferred tax assets and deferred tax liabilities are presented below:

	December 31, 2012		December 31, 2013
Deferred tax assets:
Domestic net operating loss carryforwards	$	13,669,000	$	15,627,000
Foreign net operating loss carryforwards		798,000		800,000
Deferred revenue		191,000		—
Federal and state tax credit		297,000		297,000
Stock-based compensation		586,000		682,000
Capitalized costs		1,233,000		1,232,000
Other, net		944,000		2,129,000
Total gross deferred tax assets		17,718,000		20,767,000
Less valuation allowance on deferred tax assets		(17,718,000)		(20,767,000)
Net deferred taxes		—		—
Deferred tax liabilities:
Plant and equipment, principally accelerated depreciation		—		—

Total deferred tax liabilities		—		—
Net deferred taxes	$	—	$	—