Common stock and preferred stock (Tables)

12 Months Ended

Dec. 31, 2015

Equity [Abstract]

Summary of Future Issuance of Common Stock Shares

The Company has reserved for future issuance the following number of shares of common stock (in thousands):

	December 31,
	2015		2014
Options to purchase common stock		3,532		3,652
Restricted stock units		148		179
2013 Stock Option and Incentive Plan		565		465
Warrants to purchase common stock		—		177
2013 Employee Stock Purchase Plan		227		238
Acquisition holdback (Note 11)		—		94
		4,472		4,805