Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS - Available-for-Sale Investments Included in Cash Equivalents (Details)

v3.20.1
FAIR VALUE MEASUREMENTS - Available-for-Sale Investments Included in Cash Equivalents (Details) - Cash and Cash Equivalents - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Adjusted Cost $ 81,831 $ 82,334
Gross Unrealized Losses (106) (19)
Fair Value 81,725 82,315
Level 1 | Money market funds    
Debt Securities, Available-for-sale [Line Items]    
Adjusted Cost 1,017 11,659
Gross Unrealized Losses 0 0
Fair Value 1,017 11,659
Level 2 | Time deposits    
Debt Securities, Available-for-sale [Line Items]    
Adjusted Cost 14,860 13,544
Gross Unrealized Losses 0 0
Fair Value 14,860 13,544
Level 2 | Municipal debt securities    
Debt Securities, Available-for-sale [Line Items]    
Adjusted Cost 14,059 347
Gross Unrealized Losses (7) 0
Fair Value 14,052 347
Level 2 | Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Adjusted Cost 51,895 56,784
Gross Unrealized Losses (99) (19)
Fair Value $ 51,796 $ 56,765