Description of Business and Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2019

Summary of Cash and Cash Equivalents, Measured at Fair Value on a Recurring Basis

The following table summarizes, by major security type, our cash, cash equivalents and short-term investments that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy (in thousands):



	June 30, 2019								December 31, 2018
	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Total Estimated Fair Value		Total Estimated Fair Value
Cash	$	817	$	—	$	—	$	817	$	919
Level 1 securities:
Money market funds	30,049		—		—		30,049		20,525
Level 2 securities:
U.S. government and agency securities	9,255		8		—		9,263		15,213
Corporate debt securities	13,521		11		—		13,532		30,381
Total cash, cash equivalents and short-term investments	$	53,642	$	19	$	—	$	53,661	$	67,038

Impact of Adoption of ASC 842 on Balance Sheet

The impact of the adoption of ASC 842 on our condensed consolidated balance sheet as of January 1, 2019 was as follows (in thousands):



	December 31, 2018			Adjustments due to adoption of ASC 842			January 1, 2019
Right-of-use assets, current	$	—		$	1,034		$	1,034
Right-of-use assets, non-current	$	—		$	3,174		$	3,174

Lease liabilities, current	$	—		$	1,687		$	1,687
Lease liabilities, non-current	$	—		$	4,946		$	4,946
Deferred rent, current	$	893		$	(893	)	$	—
Deferred rent, non-current	$	2,157		$	(2,157	)	$	—

Accumulated deficit	$	(2,224,746	)	$	1,196		$	(2,223,550	)