Summary of Basis of Presentation and Significant Accounting Policies - Additional Information (Detail)			12 Months Ended
	Jan. 02, 2016 shares	Dec. 11, 2015	Dec. 31, 2016 USD ($) Customer Segment shares	Dec. 31, 2015 USD ($) Customer	Dec. 31, 2014 USD ($) Customer	Jan. 01, 2016 shares
Summary Of Significant Accounting Policies [Line Items]
Marketable Securities			$ 0	$ 0
Purchase of marketable securities				2,500,000
Description of impaired investment securities			The unrealized gains and losses on available-for-sale securities are recorded in accumulated other comprehensive income (loss). The Company considers all highly liquid investments with maturities of 90 days or less at the time of purchase to be cash equivalents, and investments with maturities of greater than 90 days at the time of purchase to be marketable securities. When a marketable security incurs a significant unrealized loss for a sustained period of time, the Company will review the instrument to determine if it is other-than-temporarily impaired. If it is determined that an instrument is other-than-temporarily impaired, the Company will record the unrealized loss in the consolidated statement of operations.
Available-for-sale securities			$ 0	0
Allowance for doubtful accounts			0	0
Capitalized interest expense			0	0	$ 100,000
Warranty expense			$ 500,000
Number of segment | Segment			1
2014 Equity Plan [Member]
Summary Of Significant Accounting Policies [Line Items]
Increased number of shares authorized for grant | shares			2,817,106
2014 Equity Plan [Member] | Restricted Stock Units [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based award vesting period			3 years
2014 Equity Plan [Member] | Non-Employee Directors [Member] | Restricted Common Stock [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based award vesting period			1 year
2014 Employee Director and Consultant Equity Incentive Plan [Member]
Summary Of Significant Accounting Policies [Line Items]
Authorized for issuance, number of shares increased by | shares	463,697
Increased number of shares authorized for grant | shares						6,069,201
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Standard product warranty period			1 year
Stock-based award vesting period		3 years
Minimum [Member] | Restricted Stock Units [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based award vesting period			3 years
Minimum [Member] | 2014 Equity Plan [Member] | Restricted Stock Units [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based award vesting period			3 years
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Standard product warranty period			2 years
Maximum [Member] | Restricted Stock Units [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based award vesting period			4 years
Maximum [Member] | 2014 Equity Plan [Member] | Restricted Stock Units [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based award vesting period			4 years
Sales Returns Reserve [Member]
Summary Of Significant Accounting Policies [Line Items]
Sales return reserves			$ 100,000	$ 100,000
Total Revenue [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of customers | Customer			2	2	2
Accounts Receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of customers | Customer			3	3
Customer One [Member] | Total Revenue [Member] | Customer Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage			25.00%	14.00%	13.00%
Customer One [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage			31.00%	17.00%
Customer Two [Member] | Total Revenue [Member] | Customer Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage			15.00%	12.00%	12.00%
Customer Two [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage			17.00%	14.00%
Customers Three [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage			10.00%	13.00%