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Notes Payable - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 29, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 29, 2017
Dec. 31, 2017
Debt Instrument [Line Items]          
Proceeds from issuance of notes payable $ 20,000,000        
Credit facility default amount   $ 300,000      
Notes payable   20,200,000     $ 20,000,000
Maximum [Member]          
Debt Instrument [Line Items]          
Aggregate value of cash maintained by Australian subsidiary, limit   4,000,000      
Term Loan [Member]          
Debt Instrument [Line Items]          
Maximum borrowings under term loan $ 20,000,000 $ 20,000,000   $ 20,000,000  
Debt facility description   Upon entering into this Term Loan, the Company is obligated to make monthly, interest-only payments until March 29, 2019 and, thereafter, to pay 33 consecutive, equal monthly installments of principal and interest from April 1, 2019 through December 1, 2021. The outstanding Term Loan bears a variable interest at an annual rate of 1.25% above the prime rate, which at March 31, 2018 was 4.75%. In addition, a final payment equal to 8.0% of the Term Loan is due upon the earlier of the maturity date, acceleration of the Term Loan or prepayment of all or part of the Term Loan.      
Debt maturity date   Dec. 01, 2021      
Debt facility interest rate description   1.25% above the prime rate      
Debt facility interest rate   1.25%      
Debt facility effective interest rate   4.75%      
Debt facility fee percentage       8.00%  
Charges to interest expense of debt outstanding       $ 1,600,000  
Loan agreement minimum liquidity required   $ 21,000,000     $ 21,000,000
Debt facility covenant description   Further, as of 45 days after the Term Loan was entered in, the Company met its obligation to maintain a balance of unrestricted cash, cash equivalents and marketable securities at Silicon Valley Bank in an amount not less than the greater of (i) $55.0 million and (ii) sixty-five percent (65%) of all the Company’s cash, cash equivalents and marketable securities. If the Company does not meet this requirement it will not be considered an event of default provided it immediately secures 87.5% of the principal balance in a restricted cash account.      
Interest expense on term loan   $ 500,000      
Debt facility effective interest rate   9.20%      
Term Loan [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Percentage equivalent of cash, cash equivalents and marketable securities balance   105.00%      
2014 Credit Facility [Member] | Secured Debt [Member]          
Debt Instrument [Line Items]          
Debt facility effective interest rate     10.80%    
Interest expense on credit facility     $ 100,000