SEGMENT REPORTING, GEOGRAPHIC INFORMATION, AND SIGNIFICANT CUSTOMERS - Summary of Significant Customers (Detail) - Customer concentration risk	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues
Concentration Risk [Line Items]
Concentration risk	27.00%	69.00%	49.00%
Revenues | Samsung Electronics
Concentration Risk [Line Items]
Concentration risk	27.00%	0.00%	0.00%
Revenues | Apple Inc.
Concentration Risk [Line Items]
Concentration risk		69.00%	0.00%
Revenues | Customer A
Concentration Risk [Line Items]
Concentration risk		0.00%	20.00%
Revenues | Customer B
Concentration Risk [Line Items]
Concentration risk			18.00%
Revenues | Customer C
Concentration Risk [Line Items]
Concentration risk			11.00%
Outstanding accounts and other receivables | Customer B
Concentration Risk [Line Items]
Concentration risk	22.00%	0.00%
Outstanding accounts and other receivables | Customer E
Concentration Risk [Line Items]
Concentration risk	0.00%	55.00%
Outstanding accounts and other receivables | Customer F
Concentration Risk [Line Items]
Concentration risk	0.00%	36.00%