Proteus files for bankruptcy: Where did it falter?

Proteus files for bankruptcy: Where did it falter?

Source: 
MedCity News
snippet: 

After its partnership with Otsuka Pharmaceutical began to unravel earlier this year, Proteus Digital Health filed for bankruptcy on Monday. The company had raised more than $500 million to develop ‘smart pills’ embedded with sensors, but struggled to sell physicians and insurers on the technology.