Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.8.0.1
Summary of Significant Accounting Policies - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Customers
Dec. 31, 2016
USD ($)
Customers
Property, Plant and Equipment [Line Items]      
General and administrative expense   $ 31,436,000 $ 14,935,000
Impairment charges $ 0    
Advertising and marketing costs   1,252,000 762,000
Capitalized software development costs   0 0
Liability for Uncertain Tax Positions, Current   0 0
Accounts receivable, net   $ 7,691,000 $ 4,834,000
Preferred Stock, Dividend Rate, Percentage   8.00%  
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]      
Property, Plant and Equipment [Line Items]      
Concentration risk percentage   24.00% 30.00%
Number of major customers | Customers   2 2
Accounts Receivable [Member] | Customer Concentration Risk [Member]      
Property, Plant and Equipment [Line Items]      
Accounts receivable, net   $ 668,000 $ 939,000
Patents [Member]      
Property, Plant and Equipment [Line Items]      
General and administrative expense $ 500,000    
Property and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Useful lives of property, equipment and improvements   3 years  
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Useful lives of property, equipment and improvements   5 years  
Useful lives of property, equipment and improvements   5 years or the remaining lease term, whichever is shorter