Summary of Significant Accounting Policies - Additional Information (Details)				12 Months Ended
	Dec. 07, 2016 USD ($) $ / shares shares	Jul. 26, 2016 USD ($) $ / shares shares	Jun. 16, 2016	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($)	Jul. 20, 2016 USD ($) shares
Significant Accounting Policies [Line Items]
Common stock, shares issued | shares				20,336,000	4,382,000
Aggregate net proceeds from issuance of stock	$ 38,700,000	$ 68,500,000
Outstanding shares of redeemable convertible preferred stock converted into common stock | shares							8,531,146
Warrants automatically converted into common stock | shares							123,759
Reverse split of common stock				On June 16, 2016, our board of directors and stockholders approved an amendment to our certificate of incorporation to effect a reverse split of shares of our authorized, issued and outstanding common stock and redeemable convertible preferred stock at a 1-for-12 ratio.
Reverse stock split ratio			0.0833	0.0833
Available-for-sale investment				$ 100,541,000	$ 0
Inventory write-downs included in cost of revenue				420,000	191,000	$ 538,000
Revenue from the sale of inventory previously written down				$ 111,769,000	77,389,000	58,970,000
Foreign currency transactions, description				We record translation gains and losses in other income (expense), net on the consolidated statements of operations.
Dividends paid on common stock				$ 0
Expected dividend yield				0.00%
Deferred offering costs		$ 4,100,000		$ 0	637,000
Minimum
Significant Accounting Policies [Line Items]
Identifiable intangible assets amortized over their estimated useful lives				4 years
Support services revenue recognition period				1 year
Product warranty coverage period				90 days
Maximum
Significant Accounting Policies [Line Items]
Identifiable intangible assets amortized over their estimated useful lives				8 years
Support services revenue recognition period				3 years
Product warranty coverage period				1 year
Inventory previously written down
Significant Accounting Policies [Line Items]
Revenue from the sale of inventory previously written down				$ 162,000	492,000	$ 0
Cash Equivalents
Significant Accounting Policies [Line Items]
Available-for-sale investment					$ 0
Common Stock
Significant Accounting Policies [Line Items]
Initial public offering of shares of common | shares				7,047,000
Carrying value of redeemable convertible preferred stock							$ 106,100,000
Additional Paid-in Capital
Significant Accounting Policies [Line Items]
Carrying value of warrants							$ 505,000
IPO
Significant Accounting Policies [Line Items]
Initial public offering closing date				Jul. 26, 2016
Initial public offering of shares of common | shares		5,520,000
Common stock, share offering price | $ / shares		$ 14.00
Underwriters option
Significant Accounting Policies [Line Items]
Common stock, shares issued | shares		720,000
Follow-on Public Offering
Significant Accounting Policies [Line Items]
Initial public offering of shares of common | shares	1,527,380
Common stock, share offering price | $ / shares	$ 27.00
Follow-on public offering closing date				Dec. 07, 2016