Balance Sheet Components - Additional Information (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2013 ft²	Dec. 31, 2015 USD ($)
Balance Sheet Components [Abstract]
Depreciation and amortization expense, excluding amortization of capitalized software and intangible assets	$ 1,692,000	$ 1,035,000
Capitalized software development costs	36,000	39,000
Amortized capitalized software development costs	80,000	$ 40,000
Net book value of capitalized software development costs	307,000			$ 351,000
Square foot office building in San Luis Obispo, California | ft²			64,000
Additional construction cost	0
Financing obligation	$ 16,157,000
Lease expiration term	The lease has an initial term of 15 years and the Company has an option to extend the term of the lease for three consecutive terms of five years each.
Lease term	15 years