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Assets and Liabilities Measured at Fair Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value $ 76,865 $ 119,053
Money Market Funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value [1] 15,369 29,090
Restricted cash    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value [2]   50
U.S. Government Agency Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value 51,490 [3] 74,139 [4]
Federal Agency Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value [1]   999
Federal Agency Securities | Short-Term Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value [3] 10,006 14,775
Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value 66,859 103,279
Fair Value, Inputs, Level 1 | Money Market Funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value [1] 15,369 29,090
Fair Value, Inputs, Level 1 | Restricted cash    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value [2]   50
Fair Value, Inputs, Level 1 | U.S. Government Agency Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value 51,490 [3] 74,139 [4]
Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value 10,006 15,774
Fair Value, Inputs, Level 2 | Federal Agency Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value [1]   999
Fair Value, Inputs, Level 2 | Federal Agency Securities | Short-Term Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value [3] $ 10,006 $ 14,775
[1] Included in cash and cash equivalents on accompanying consolidated balance sheet.
[2] $0.05 million of restricted cash serves as collateral for the Company’s corporate credit card.
[3] Included in short-term investments on accompanying consolidated balance sheet and are classified as available-for-sale debt securities.
[4] Included in short-term investments on accompanying consolidated balance sheet and are classified as available-for-sale debt securities.