Common Stock (Tables)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Reserved Shares of Common Stock

Reserved shares of common stock are as follows for the dates presented:

	December 31,
	2017		2016
Options or RSUs available for future grant under stock option plans		999		839
Options outstanding under stock option plans		436		536
RSUs outstanding under stock option plans		568		429
Shares available for future issuance under employee stock purchase plan		182		170
Shares to be issued in connection with acquisition of SocialMoov		—		66
		2,185		2,040