Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS - Fair value of held-to-maturity securities (Details)

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FAIR VALUE MEASUREMENTS - Fair value of held-to-maturity securities (Details) - US Treasury Securities [Member]
6 Months Ended
Jun. 30, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Amortized Cost $ 175,317,637
Gross Holding Gain 71,407
Fair Value $ 175,389,044