Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2017

Summary of Significant Accounting Policies

Summary of Marketable Securities by Security Type

At June 30, 2017, marketable securities by security type consisted of:

			Gross		Gross		Estimated
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
United States treasury notes	$	3,000	$	—	$	—	$	3,000
Total	$	3,000	$	—	$	—	$	3,000

At December 31, 2016, marketable securities by security type consisted of:

			Gross		Gross		Estimated
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
United States treasury notes	$	35,216	$	1	$	(8)	$	35,209
Total	$	35,216	$	1	$	(8)	$	35,209

Schedule of Antidilutive Securities, Excluded from Computation of Diluted Net Loss per Share

	As of June 30,
	2017	2016
Options to purchase common stock	4,657,912	3,008,890
Warrants for the purchase of common stock	18,939	18,939
	4,676,851	3,027,829