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Bank and Other Borrowings (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2018
Jan. 18, 2018
Dec. 17, 2017
Nov. 28, 2017
Jan. 20, 2017
Aug. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 17, 2018
Bank Borrowings (Textual)                  
Weighted average interest rate             13.92% 6.73%  
Short term loan             $ 11,010 $ 12,648  
Short term debt, description             The 2016 Warrants were replaced by Replacement Warrants to acquire an aggregate of 417,166 the Group's ordinary shares classified as permanent equity. As the modification of the 2016 Warrants term resulted in the reclassification of the 2016 Warrants from liability to equity, the 2016 Warrants amounted to US$1,544 were re-measured at fair value upon Merger and reclassified to additional paid in capital as of December 31, 2017.    
Long-term bank borrowing, description   This transaction was completed on March 22, 2018. Subject to board approval, the Company agreed to issue 183,342 additional shares to the Selling Shareholders if the aggregate value of the ordinary shares initially issued at the closing to the Selling Shareholders was less than $3,000 in fair value as of August 18, 2018. The board of directors approved and 183,342 shares that were issued on January 10, 2019              
Other borrowings             $ 23,073    
Warrant [Member]                  
Bank Borrowings (Textual)                  
Short term debt, description             In August 2016, the Group issued 2,515,123 and 1,900,800 warrants ("2016 Warrants") to two banks in connection with a short term loan facility of $2,000,000 and a long term loan facility of $6,000,000 respectively, for working capital purpose. The 2016 Warrants entitled the banks to subscribe for Series D convertible redeemable preferred shares at the exercise price of $0.5059. The 2016 Warrants shall lapse and expire after 5 and 7 years from their issuance dates, respectively. The 2016 Warrants were replaced by Replacement Warrants to acquire an aggregate of 417,166 the Group's ordinary shares at the consummation date of the Merger.    
PFG5 [Member]                  
Bank Borrowings (Textual)                  
Weighted average interest rate             8.40% 7.97%  
Interest rate                 12.00%
Long-term bank borrowing             $ 5,770    
Short-term bank borrowing with an outstanding balance $ 3,000           3,146    
Long-term bank borrowing, description Bearing an interest rate of 8% per annum from May 1, 2018 to October 31, 2018 and an interest rate of 12% per annum from November 1, 2018 to April 30, 2021, which is the maturity date.   The Group entered into a convertible term loan agreement (the "PFG note") with PFG5, bearing an interest rate of 12% per annum. The principal of this loan is $1,000 which matures in full on December 17, 2023. The outstanding principal balance of $1,000 as of December 31, 2018 and accrued interest of $5 was fully repaid in December 2018. At any time while the PFG note was outstanding, upon notice only, PFG may elect to convert the PFG note into 208,768 ordinary shares of the Company at the conversion price of $4.79 per share.            
Accrued interest             $ 185    
PFG4 [Member]                  
Bank Borrowings (Textual)                  
Weighted average interest rate             8.40% 7.97%  
Interest rate         8.00% 8.00%      
Long-term bank borrowing         $ 2,000 $ 6,000 $ 5,770    
Short-term bank borrowing with an outstanding balance             $ 3,808 $ 5,432  
Maturity date         Jan. 20, 2020 Aug. 30, 2019      
Long-term bank borrowing, description             The outstanding principal balance as of December 31, 2018 was $1,624 and accrued interests of $316 was fully repaid in 2018.    
Accrued interest             $ 316 595  
PFG [Member]                  
Bank Borrowings (Textual)                  
Long-term bank borrowing             5,770    
HHMC Microelectronic Co., Limited [Member]                  
Bank Borrowings (Textual)                  
Short term bank term       Three months          
Short term loan       $ 5,000          
Interest rate       0.04%          
Interest rate will increase       0.10%          
Short-term bank borrowing with an outstanding balance             2,405 5,000  
Repaid balance             $ 2,595    
Maturity date             Jun. 30, 2019    
Accrued interest             $ 1,080 68  
SPD Silicon Valley Bank Co., Ltd [Member]                  
Bank Borrowings (Textual)                  
Interest rate             8.05%    
Short-term bank borrowing with an outstanding balance             $ 8,604 $ 7,648  
Maturity date             Aug. 31, 2018    
Additional borrowing             $ 956    
Long-term bank borrowing, description               The loan bore an interest rate from 6% to 8% per annum based on the LIBOR rate.  
Line of credit facility amount             8,623    
Interest paid             $ 521 $ 440