Income Taxes (Tables)

6 Months Ended

Jun. 30, 2017

Income Tax Disclosure [Abstract]

Summary of the provision for (benefit from) income taxes

The components of the provision for income taxes are shown below for the periods presented (in thousands):

	Three months ended June 30,				Six months ended June 30,
	2017		2016		2017		2016
Current:
U.S. federal	$	—	$	—	$	—	$	—
State	—		—		—		11
Provision for income taxes	$	—	$	—	$	—	$	11