Balance Sheet Information - Summary of Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Payables And Accruals [Abstract]
Executive deferred compensation	$ 1,940	$ 0
Inventory receipts	1,831	1,489
Paid time off	1,251	1,154
Payroll, bonuses, and other employee benefits	633	3,267
Warranties	296	305
Income and sales taxes	261	159
Real estate taxes	205	160
Contractors and temporary labor	154	232
Deferred rent and revenues	136	199
Professional fees	135	309
Employee stock purchase plan	121	292
Other	285	237
Total	$ 7,248	$ 7,803